"Recurvous" is a unusual word in English language, and there are few synonyms that match its exact definition. However, one could use "curved", "arched" or "bowed" as possible alternative words. "Sinuous" and "serpentine" might also apply in certain contexts to convey the meaning of something that follows a curved or winding course. "Swerving" or "meandering" could also be used as synonyns. Essentially, any word that describes a curved or arching shape could be a potential substitute for "recurvous". While there may not be many direct synonyms available, incorporating these related words into your writing can add depth and clarity.